53115403121718 has 128 divisors (see below), whose sum is σ = 128910071808000. Its totient is φ = 14252204057472.

The previous prime is 53115403121579. The next prime is 53115403121719. The reversal of 53115403121718 is 81712130451135.

It is a super-3 number, since 3×53115403121718³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 53115403121718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53115403121719) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 59363655 + ... + 60251757.

It is an arithmetic number, because the mean of its divisors is an integer number (1007109936000).

Almost surely, 2^{53115403121718} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53115403121718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64455035904000).

53115403121718 is an abundant number, since it is smaller than the sum of its proper divisors (75794668686282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53115403121718 is a wasteful number, since it uses less digits than its factorization.

53115403121718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888786.

The product of its (nonzero) digits is 100800, while the sum is 42.

The spelling of 53115403121718 in words is "fifty-three trillion, one hundred fifteen billion, four hundred three million, one hundred twenty-one thousand, seven hundred eighteen".